add optional libao to shairport-sync

media-sound/shairport-sync/shairport-sync-2.8.4.1.ebuild

@@ -12,7 +12,7 @@ SRC_URI="https://github.com/mikebrady/${PN}/archive/${PV}.tar.gz"
 LICENSE="MIT"
 SLOT="0"
 KEYWORDS="amd64 ~x86"
-IUSE="avahi soxr"
+IUSE="avahi ao soxr"
 
 DEPEND="dev-libs/openssl
 	media-libs/alsa-lib
@@ -20,6 +20,7 @@ DEPEND="dev-libs/openssl
 	dev-libs/popt
 	dev-libs/libconfig
 	avahi? ( net-dns/avahi )
+	ao? ( media-libs/libao )
 	soxr? ( media-libs/soxr )"
 RDEPEND="${DEPEND}"
 
@@ -40,6 +41,9 @@ src_configure() {
 	if use soxr ; then
 		myconf+=" --with-soxr"
 	fi
+	if use ao ; then
+		myconf+=" --with-ao"
+	fi
 	econf ${myconf} \
 		--with-ssl=openssl \
 		--with-alsa